NCERT Class VII Science Solutions: Chapter 9 – Soil Part 3

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Question 11:

Is it a good practice to remove grass and small plants that are growing in an open. Unused field? Give reason to support your answer.

Answer:

No, it is not a good practice. Plants cover the soil surface and their roots bind the soil particles and hold them in place. During strong winds and rains they prevent soil erosion and thereby protect the top soil.

Question 12:

A man digging a pit found that he could dig with case initially but digging became difficult as he went deeper. He could not dig beyond a depth of 5 feet. Provide a suitable scientific explanation.

Answer:

The soil surface has loose top soil which is easier to dig. At deeper layers. Partially weathered rocks or bedrocks are present. Which are hard making digging difficult.

Question 13:

Locate the following zones given as boxed items in Figure which shows a diagram of soil profile.

Top soil, Subsoil, C-horizon, Bedrock

As showing in images is a diagram of soil profile.(Q)

Diagram of Soil Profile.(Q)

As showing in images is a diagram of soil profile.(Q)

Answer:

As showing in images is a diagram of soil profile.(A)

Diagram of Soil Profile.(A)

As showing in images is a diagram of soil profile.(A)

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